Improvement in heddle-actuating mechanisms



` Y l -3Shetas-'Sheet'1.v l. CRAWSHAW. Y

lmprdvement if: Heddle ctuaing Mechanism.

N0. 129,718.- 4 Patented Jqly 23, 1872.

' 3Sheet`s--Sheet2`. )L CRAWSHAW.

Improvement in Heddl Actuating Mechanism.

129,718. i Patentedjuy23,18'72.

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NITEDSTATES" PATENT QFFIGE.

a `JOHN cnAwsHAw, or concime, I"criminal IMPROVEMENT INHEDDLE-ACTUATING'MECHANISMS.

7 Specification forming part of' Letters Patent No. 129,718, dated July23, 1872. A

Specification describing a new and useful Improvement in Looms, inventedby'JOHN GRAWSHAW, of Cobourg,in the Province Vof Ontario and Dominion ofCanada.

This invention has for its object to simplify the mechanism forproducingthe harness-motion in fancy and other looms. y The invention consists`chiefly in the use of vibrating bell-` cranks on a sliding frame, thecranks serving to vibrate the jacks, whereby the harnessis raised andlowered. The harness is, by this arrangement, raised and-lowered at onemotion,where hitherto two have been usually required. `The inventionalso. consists inother improvements regarding the cam which turns thechain, the levers which reset the jacksA and lower the harness aftereach stroke, and other details, as hereinafter more fully described.

a tail side view of the resetting-levers and their connection.

i Similar letters of reference indicate corresponding parts. A in thedrawing represents the frame ofthe 1oom, on which the warp-drum, thewindingup drum, the battcn, reed, tension, and shuttle devices arearranged, applied, and constructed in suitable manner. B is the shaft,whereby the harness mechanism receives its motion.

This shaft hangs transversely in the frame A,

and receives rotary motion by suitable connection. The heddles C (l aresuspended from cords' a`a,`which pass over friction-rollers bib', andare attached tothe upper ends of v levers or jacks D D. These said jacksare hung side by side on a pin,d, which `is supported horizontally atthe side of the frame A. There is one jack, D, for every heddle, G. Whenthe upper end of a jack, D, is swung away from the loom the heddleconnected with it is thereby drawn up. The lower part of each heddle is,by a cord, e, which passes over a friction roller or rollers, f,connected with the lower end of one of alower set of jacks, E E. Theselatter are hungkside bysideto a pin, g, which i is `supported.horizontally at the side of the loom. Itmaybe observed thatthe upperends of lthe jacks E are directly beneath and close to the lower ends ofthe jacks D, and further that the two jacks D E, which pertain to each4single heddle, are in line with each other ver-y tically. It is evidentthat a heddle will be drawn down whenever the lower end of, the jack Ewith which` it is connected is swung away from the loom. The requisitemotion is imparted to the'several jacks D E by means of elbow-levers orbell-cranksF F, which han g on a pin, h, that is held in a horizontalsliding frame, G. This frame is moved back and forth by means of acrank-shaft, J, which is revolved i by bevel-wheel connection 'i withthe shaft B, the cranks of the shaft J entering forward projections ofthe frame Gr. The frame G carries also the upper chain-drum H, fromwhich the chain I is suspended in the ordinary manner; The projectionsof the chain bear, as the drum H is gradually turned in their propersuccession, against the vertical arms of the bell-cranks \F, and vibratethese cranks so as to elevate their horizontal arms. In their neutralposition the horizontal arms of the bell-cranks are in line with theupper ends of the lower jacks E. When the bellcranks are, however,vibrated by contact withthe chain I the ends of 'their horizontal armswill be raised in line with the lower ends of the upper jacks D. It isevident that one bell-crank, F, is provided for every pair of jacks, DE. Whenever the frame Gr is, by the crank-shaft J, drawn toward theloom, those of its elbow-levers F, which are effected by the chain I,will bear against their respective upper jacks D and vibrate them so asto raise the heddles connected thereto. The remainin gbellcranks willbear against the-upper ends of their respective lower jacks E and drawthe heddlesconnected therewith down. On the return move of the frame G-that is to say, when said frame moves away from the loom-the contact ofthebell-cranks with the jacks is terminated and the heddles are atliberty to resume their neutral, i. e., middle, po-

sition, which is neither entirelyup nor down. In

order to bring all heddles, on such return stroke .of the frame G, totheir middle or neutral position,.two levers,vL L', arepivoted atj l.,respectively, to the frame A, one above the other, (see Fig. 4,) andlock together at their contiguous ends by tenon and socket m, as shown.By means of a projecting pin, n, one of these levers, L, is connectedwith a rod, o, pivoted to an arm or lever, M, which is suspended at itsupper end from the frame A. The lower part of the lever M is in contactwith a cam, p, which is mountedupon the shaft J The levers L and L carryprojecting arms r and s, respectively, behind the upper parts of thejacks D and the lower parts of the jacks E. When the frame G is on itsreturn stroke to clear the jacks from contact with the bell-cranks, asabove mentioned, the cam p swings the lever M, and there by also thelevers L L', so that the latter will lay their arms r s against thejacks D E, respectively, and thereby swing the jacks baclr to theirrespective neutral positions, and draw the heddles all into line witheach other-z'. e., so that they areneither entirely up nor down. Thejacks are then in position for the next contact with the bell-cranks,which are chan ged by the chain during the return move of the frame G,or at the end of the return move, while the bell-cranks are not incontact with the jacks. Thus it will be seen that one rotation of thecrank-shaft J, producing a back-'and-forward motion of the frame G and avibration of the levers L L', will suice to move the heddles in advanceof and subsequent to a shuttle movement. The mechanism is very simpleand positive in its action, and under complete control. The chain-drum Hreceives its intermittent rotary motion by means of a Worm, t, which isattached to a sleeve, u, embracing a shaft, N. This shaft N, hanging inbearings that project from the frame G, moves back and forth with thelatter, and slides meanwhile through the gear-wheel o, which gives itrotary motion. The gear-wheel o matches into another toothed wheel, w,on the shaft B, and is, by feather and groove, connected with the shaftN to rcvolve the same during the reciprocating motion of the frame G.The worm t enters a notched disk, which is mounted upon the end of thedrum H, and turns the dislr and drum by passing gradually from notchtonotch, one revolution of the shaft N producing` one change of notch tonotch, and a consequent partial turn of the chain. The sleeve u is, by aspring, (not shown,) held with a notch in its end against a pin, y,which projects from the shaft N, as shown in Fig. 3. When from any onecause the drum H docs not turn with proper ease, so that its attempt toremain at rest will overcome the power of the concealed spring, theshaft N will carry its pin .y out of the notch in the sleeve, crowdingthe sleeve back against the spring, and will revolve without affectingthe position of the spring. The drum H will, in that case, not beturned.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The bell-cranks F F, hung in the reciprocatingframe G to actuate the jacks D E and theloom-harncss, substantially asherein shown and described.

2. The interlocking vibrating levers L L',

provided with the projecting arms 1^ and s tol return the jacks D E andthe heddles to their neutral position, arranged and operated asspecified.

3. The crank-shaft J, combined with the reciprocating frame G and withthe levers L L to actuate them, substantially as herein shown anddescribed. I

4. The rotary reciprocating shaft N for carrying the adjustable sleeve ufor turning the chain-drum, and the pin y for locking said sleeve,substantially as herein shown and lescribed.

JOHN CRAVVSHAN.

Witnesses:

GEORGE LEY, W. A GRAHAM.

